Knock Knock!!

Riddle: A woman is sitting in her hotel room when someone knocks at the door. She opened the door to find a man she’s never seen before. He says, "Oh I'm sorry, I made a mistake and thought this was my room." He then ran away and got into an elevator so the woman shut her door and phoned security. What made the woman so suspicious?

Answer: You don’t knock on your own hotel room door.

Source: https://www.riddles.com/index.php/10597

A woman is sitting in her hotel room when someone knocks at the door. She opened the door to find a man she’s never seen before. He says, "Oh I'm sorry, I made a mistake and thought this was my room." He then ran away and got into an elevator so the woman shut her door and phoned security. What made the woman so suspicious? — Knock Knock!! by kanish Riddle